CN210151577U - A post-casting slot and formwork for prefabricated track beam concrete - Google Patents

Description

A post-casting slot and formwork for prefabricated track beam concrete

technical field

The utility model relates to the field of rail transit, in particular to a post-casting slot, a template and a construction method of an assembled rail beam concrete.

Background technique

In recent years, with the sustained and rapid development of my country's economy, the awareness of energy conservation and environmental protection has become the mainstream of society, and my country's prefabricated building structures have gradually been recognized by the society. As a new type of structure that adapts to the process of building industrialization, the prefabricated composite structure has become a structural form more and more favored by engineers due to its advantages of fast component processing, environmental protection, and good economic benefits. Comparable advantages and huge development prospects.

The reliability of the connection between the precast concrete slab and the steel box is the main problem of the steel-precast concrete composite beam. The connection is realized in the post-cast slot reserved in the precast concrete slab, and the shear force is arranged in the slot. The nail group, the shear nail group is welded on the steel box. The main realization form is to arrange reserved slots through the template during the precast concrete slab process. The steel-concrete combination, therefore, the setting and reservation of the notch becomes the main work during the production of the precast concrete slab, which plays a vital role in the later realization of the steel-concrete combination.

However, pouring concrete in the reserved slot to connect the precast concrete slab and the steel box has the following problems. Under the action, cracks are prone to occur, which affects the stable connection of the precast concrete slab and the steel box, resulting in potential safety hazards in operation.

Utility model content

The purpose of the utility model is to overcome the existing connection between the precast concrete slab and the steel box through the shear nail group and the post-cast concrete. Cracks occur, which will affect the stable connection of the precast concrete slab and the steel box, and lead to the above-mentioned shortcomings of potential safety hazards in operation. Provided are a post-casting slot, formwork and construction method for prefabricated track beam concrete.

In order to realize the above-mentioned purpose of the utility model, the utility model provides the following technical solutions:

An assembled track beam concrete post pouring slot, comprising at least one slot body vertically penetrating a precast concrete slab, the prefabricated concrete slab is used for assembling with a steel box, and all the steel boxes corresponding to the slot body The top surface is provided with a group of shearing nails, and each of the notch body is provided with a reinforcing mesh, the reinforcing mesh is located above the shearing nail group, and the reinforcing mesh is embedded in the prefabricated concrete slab.

Using the post-casting slot of the prefabricated track beam concrete of the present invention, the steel mesh is provided in the slot body. Cracks are easy to appear under the action of shrinkage, creep and temperature difference, but post-cast concrete can firmly connect the steel mesh and the shear nail group, so as to firmly connect the precast concrete slab and the steel box, and at the same time pass the steel reinforcement The net improves the bonding force between the old and new concrete, greatly reduces the occurrence of cracks, and avoids potential safety hazards.

Preferably, the prefabricated concrete slab is provided with a steel frame, and the steel mesh is connected to the steel frame.

Preferably, the steel mesh is welded to the steel frame.

Preferably, at least two rows of the slot bodies are provided along the length direction of the precast concrete slab, and the slot bodies of two adjacent rows are arranged in a staggered manner.

Preferably, after the prefabricated concrete slab and the steel box are assembled, each slot body is used for setting a cast-in-place concrete structure.

Preferably, the slot body is arranged vertically.

Preferably, the horizontal section of the slot body is rectangular or circular.

Since the steel mesh is provided in the slot body of the post pouring slot of the above-mentioned assembled track beam concrete, the traditional slot body forming template is no longer applicable, so the utility model also provides an assembly The formwork for the post pouring slot of the rail beam concrete, including the upper formwork and the lower formwork, the upper formwork and the lower formwork can be disassembled and closed, and the upper formwork and the lower formwork are used for setting in the groove as described above. Around the mouth body, the bottom edge of the upper template is provided with a number of half-slot holes, the top side of the lower template is provided with a number of corresponding half-slot holes, and the half-slot holes after the mold is closed form a slot hole, The reinforcing bars on the reinforcing mesh enter the area of the precast concrete slab to be poured through the slot holes, and the bottom edge of the upper formwork and the top edge of the lower formwork are rotatably abutted along the longitudinal axis.

By adopting the formwork for the post-casting slot of the prefabricated track beam concrete according to the present invention, the half-slot hole is arranged between the upper formwork and the lower formwork boundary line of the detachable mold to form the steel bar. The slot holes through which the steel bars of the mesh can pass meet the above-mentioned requirements for post-casting slot forming of the prefabricated track beam concrete. At the same time, after the precast concrete slab is cast and formed, due to factors such as adhesion and concrete bonding, Influence, it is difficult to directly pull out the upper formwork from the lower formwork to remove the formwork. The bottom edge of the upper formwork and the top edge of the lower formwork are rotatably abutted, and the upper formwork first faces the lower formwork when removing the formwork. The top edge of the formwork is reciprocated and rotated, which is convenient for demoulding. The formwork of the post pouring slot has a simple structure, is easy to use, has good effect and can be reused.

Preferably, the longitudinal section of the bottom edge of the upper template along the length direction is a U-shaped flange, the corresponding longitudinal section of the top edge of the lower template along the length direction is a U-shaped groove, and the U-shaped flange is adapted to the U-shaped flange. shaped groove.

With this structure, the U-shaped flange on the bottom edge of the upper template and the U-shaped groove on the top edge of the lower template can realize socket insertion and relative rotation, which is convenient for stability during mold clamping and mold removal. Easy to turn and demould.

Preferably, the longitudinal section of the bottom edge of the upper template along the length direction is a U-shaped groove, and the corresponding longitudinal section of the top edge of the lower template along the length direction is a U-shaped flange, and the U-shaped flange is adapted to the U-shaped flange. shaped groove.

With this structure, the U-shaped flange on the bottom edge of the upper template and the U-shaped groove on the top edge of the lower template can realize socket insertion and relative rotation, which is convenient for stability during mold clamping and mold removal. Easy to turn and demould.

Preferably, a side of the upper formwork facing the precast concrete slab area to be poured and a side of the lower formwork facing the precast concrete slab area to be poured are provided with several protrusions.

By adopting this structure, concave holes adapted to the protrusions can be formed on the side walls of the formed precast concrete slabs, and after the notch itself is poured, the post-cast concrete will fill the concave holes, thereby They mesh with each other and increase the contact area between the precast concrete slab and the post-cast concrete, improve the occlusion between the precast concrete slab and the post-cast concrete, and ensure the stability between the old and new concrete. combine.

Preferably, the upper formwork and the lower formwork are steel formwork or wood formwork.

The utility model also provides a construction method for the post-cast notch of the prefabricated track beam concrete, using the template for the post-cast notch as described above, and the construction method comprises the following steps:

A. The pouring formwork of the precast concrete slab is set, and the upper formwork and the lower formwork for forming the notch body are set therein;

B. Inserting the reinforcing bars in the slots formed by the half-slot holes of the upper template and the half-slot holes of the lower template to form the steel mesh;

C, pouring described precast concrete slab area concrete and curing molding;

D. Remove the upper formwork from the upper part of the precast concrete slab;

E. Lifting or jacking up the prefabricated concrete slab, removing the lower formwork from the lower part of the prefabricated concrete slab, and completing the prefabrication of the prefabricated concrete slab and the reservation of the slot body.

By adopting the construction method for the post-casting slot of the prefabricated rail beam concrete according to the present invention, the above-mentioned post-casting slot of the prefabricated rail beam concrete can be quickly and conveniently produced by using the upper formwork and the lower formwork. At the same time, it can be easily and quickly demolded, the construction method has simple steps, convenient operation and good effect.

To sum up, due to the adoption of the above-mentioned technical solutions, the beneficial effects of the present utility model are:

1. Using the post-pouring slot of a prefabricated track beam concrete described in the present utility model, the slot body is provided with the steel mesh. When the slot body is poured, even if the new and old concrete interface is under external load And the concrete shrinks and creeps, and cracks easily occur under the action of temperature difference, but the post-cast concrete can firmly connect the steel mesh and the shear nail group, so as to connect the precast concrete slab and the steel box firmly, and at the same time through all the The steel mesh improves the bonding force between the old and new concrete, greatly reduces the occurrence of cracks, and avoids potential safety hazards.

2. Using the formwork of the post-grouting slot of the assembled track beam concrete described in the present invention, the half-slot hole is arranged between the upper formwork and the lower formwork boundary line of the detachable mold to form all the grooves. The slot holes through which the reinforcing bars of the reinforcing mesh can pass meet the requirements of the above-mentioned prefabricated rail beam concrete post-casting slot forming requirements. At the same time, after the precast concrete slab is cast and formed, due to adhesion and concrete bonding Influenced by factors, it is difficult to directly pull out the upper formwork from the lower formwork to remove the formwork. The bottom edge of the upper formwork and the top edge of the lower formwork are rotatably abutted. The top edge of the lower formwork is reciprocated and rotated, which is convenient for demoulding. The formwork of the post-casting slot has a simple structure, is easy to use, has a good effect, and can be reused;

3. Using the formwork for the back pouring slot of an assembled track beam concrete according to the present invention, the U-shaped flange on the bottom edge of the upper formwork and the U-shaped groove on the top edge of the lower formwork It can realize socket and relative rotation, which is convenient for stability during mold clamping and easy rotation and demoulding during mold removal;

4. Using the formwork for the post pouring slot of the prefabricated track beam concrete according to the present invention, the upper formwork faces the side of the precast concrete slab area to be poured and the lower formwork faces the place to be poured. One side of the precast concrete slab area is provided with a plurality of protrusions, which can form concave holes adapted to the protrusions on the side wall of the formed precast concrete slab. The post-cast concrete will fill the concave holes, so as to mesh with each other, increase the contact area between the precast concrete slab and the post-cast concrete, and improve the contact area between the precast concrete slab and the post-cast concrete. The degree of occlusion ensures a stable combination between the old and new concrete;

5. Using the construction method for the post-casting slot of the prefabricated rail beam concrete described in the present utility model, the above-mentioned prefabricated rail beam concrete post-grouting groove can be quickly and conveniently produced by using the upper formwork and the lower formwork At the same time, it can be easily and quickly demoulded. The construction method has simple steps, convenient operation and good effect.

Description of drawings

Fig. 1 is the structural representation of a kind of prefabricated track beam concrete back pouring slot described in the utility model;

Fig. 2 is the connection schematic diagram of precast concrete slab and steel box;

Fig. 3 is the top view of Fig. 2;

4 is a schematic structural diagram of a formwork for a post-grouting slot of an assembled track beam concrete according to the utility model;

Fig. 5 is the schematic diagram of demolding of upper template and lower template in Fig. 4;

FIG. 6 is a left side view of FIG. 5 .

Marking in the figure: 1- Precast concrete slab, 11- Notch body, 12- Steel mesh, 2- Steel box, 21- Shear nail group, 3- Cast-in-place concrete structure, 4- Upper formwork, 41- U-shaped convex Rim, 5-lower template, 51-U-shaped groove, 6-half-slotted hole, 7-protrusion.

Detailed ways

The present utility model will be further described in detail below in conjunction with the test examples and specific embodiments. But it should not be construed that the scope of the above-mentioned subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

Example 1

As shown in Figures 1-3, the post-casting slot of an assembled track beam concrete according to the present invention includes at least one slot body 11 vertically penetrating the precast concrete slab 1. The slot body 11 is horizontal The cross section is rectangular, and at least two rows of the slot bodies 11 are provided along the length direction of the precast concrete slab 1 , and the slot bodies 11 of two adjacent rows are arranged in a staggered manner.

The prefabricated concrete slab 1 is used for assembling with the steel box 2, the top surface of the steel box 2 corresponding to all the slot bodies 11 is provided with shear nail groups 21, and each of the slot bodies 11 is provided with steel bars Mesh 12, the reinforcement mesh 12 is located above the shear nail group 21, the precast concrete slab 1 is provided with a reinforcement frame, the reinforcement mesh 12 is welded to the reinforcement frame, the precast concrete slab 1 and all After the steel box 2 is assembled, a cast-in-place concrete structure 3 is arranged in each of the slot bodies 11 to connect the precast concrete slab 1 and the steel box 2 .

Using the post-casting slot of the prefabricated track beam concrete of the present invention, the slot body 11 is provided with the steel mesh 12. After the slot body 11 is poured, even if the new and old concrete interface is outside Cracks are prone to occur under the action of load, shrinkage and creep of concrete and temperature difference, but post-cast concrete can stably connect the steel mesh 12 and the shear nail group 21, so as to stabilize the precast concrete slab 1 and the steel box 2 At the same time, the bonding force between the old and new concrete is improved through the steel mesh 12, the occurrence of cracks is greatly reduced, and potential safety hazards are avoided.

Example 2

Since the steel mesh 12 is provided in the slot body 11 of the post-cast slot of the prefabricated track beam concrete described in Embodiment 1, the conventional forming template for the slot body 11 is no longer applicable.

As shown in Figures 1-6, the present utility model provides a formwork for an assembled track beam concrete back pouring slot, including an upper formwork 4 and a lower formwork 5, and the upper formwork 4 and the lower formwork 5 are steel formwork .

The upper die plate 4 and the lower die plate 5 can be disassembled and detached, and the upper die plate 4 and the lower die plate 5 are used to be arranged around the slot body 11 as described in Embodiment 1, and the upper die plate 4 The bottom side is provided with a number of half-slot holes 6, the top side of the lower formwork 5 is provided with a number of corresponding half-slot holes 6, the half-slot holes 6 after the mold is closed form a slot hole, and the steel mesh 12 The upper steel bar enters the area of the precast concrete slab 1 to be poured through the slot hole, the longitudinal section of the bottom edge of the upper formwork 4 along the length direction is a U-shaped flange 41, and the corresponding length of the top edge of the lower formwork 5 is The longitudinal section in the direction is a U-shaped groove 51, and the U-shaped flange 41 is adapted to the U-shaped groove 51. As shown in FIG. 6, since the bottom edge of the upper template 4 has the U-shaped flange 41 Because of this socket segment, the half-slot hole 6 on the bottom edge of the upper template 4 in FIG. 5 is longer than the half-slot hole 6 on the top side of the lower template 5. After the mold plate 5 is clamped, the U-shaped flange 41 is inserted into the U-shaped groove 51, the half-slot hole 6 on the bottom edge of the upper mold plate 4 and the top edge of the lower mold plate 5 The half slot hole 6 forms the slot hole as shown in FIG. 4 .

As a preferred solution of this embodiment, the side of the upper formwork 4 facing the area of the precast concrete slab 1 to be poured and the side of the lower formwork 5 facing the area of the precast concrete slab 1 to be poured are provided with There are several protrusions 6. With this structure, concave holes that are adapted to the protrusions 6 can be formed on the side walls of the precast concrete slab 1. After the slot body 11 is cast in place, the The poured concrete will fill the concave holes, so as to mesh with each other, increase the contact area between the precast concrete slab 1 and the post-cast concrete, and improve the gap between the precast concrete slab 1 and the post-cast concrete. The high occlusion ensures a stable bond between the old and new concrete.

Using the formwork for the post-grouting slot of the assembled track beam concrete described in the present invention, the half-slot hole 6 is arranged between the boundary line of the upper formwork 4 and the lower formwork 5 of the detachable mold to form a form. The slots through which the reinforcement bars of the reinforcement mesh 12 can pass meet the above-mentioned requirements for forming the post-casting slot of the prefabricated rail beam concrete. Due to the influence of factors such as bonding, it is difficult for the upper template 4 to be directly pulled out from the lower template 5 for demolding. The U-shaped groove 51 can realize socket insertion and relative rotation, which is convenient for stability during mold clamping and convenient rotation and demoulding during mold removal. It can be rotated for demoulding, and the template structure of the post pouring slot is simple in structure, convenient in use, good in effect, and can be reused.

Example 3

As shown in Figures 1-6, the construction method of a post-cast notch of an assembled track beam concrete according to the present invention applies the template of the post-cast notch as described in Example 2, and the construction method includes the following steps :

A. The pouring formwork of the precast concrete slab 1 is set, and the upper formwork 4 and the lower formwork 5 for forming the notch body 11 are set therein;

B. Insert the reinforcing bars into the slots formed by the half-slot holes 6 of the upper template 4 and the half-slot holes 6 of the lower template 5 to form the steel mesh 12;

C, pouring described precast concrete slab 1 area concrete and curing molding;

D. Remove the upper formwork 4 from the upper part of the precast concrete slab 1;

E. Lifting or jacking up the prefabricated concrete slab 1 , removing the lower formwork 5 from the lower part of the prefabricated concrete slab 1 , and completing the prefabrication of the prefabricated concrete slab 1 and the reservation of the slot body 11 .

By using the construction method of the post-casting slot of the prefabricated rail beam concrete described in the present utility model, the above-mentioned prefabricated rail beam concrete post-grouting groove can be quickly and conveniently produced by using the upper formwork 4 and the lower formwork 5 At the same time, it can be easily and quickly demoulded. The construction method has simple steps, convenient operation and good effect.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (10)

1. The assembled track beam concrete post-pouring trough opening is characterized by comprising at least one notch body (11) which vertically penetrates through a precast concrete plate (1), wherein the precast concrete plate (1) is used for being assembled with a steel box (2), the top surface of the steel box (2) corresponding to the notch body (11) is provided with a shear nail group (21), a reinforcing mesh (12) is arranged in each notch body (11), the reinforcing mesh (12) is positioned above the shear nail group (21), and the reinforcing mesh (12) is embedded into the precast concrete plate (1).

2. The fabricated track beam concrete post-cast trough according to claim 1, characterized in that a steel reinforcement cage is provided in the precast concrete plate (1), and the steel reinforcement mesh (12) is connected to the steel reinforcement cage.

3. The fabricated track beam concrete post-cast spout according to claim 2, wherein the mesh reinforcement (12) is welded to the steel reinforcement cage.

4. The fabricated track beam concrete post-cast trough according to claim 1, characterized in that at least two rows of the notch bodies (11) are arranged along the length direction of the precast concrete plate (1), and the notch bodies (11) of the adjacent two rows are arranged in a staggered manner.

5. The fabricated track beam concrete post-cast slot according to any one of claims 1 to 4, wherein each of the slot bodies (11) is used for arranging a cast-in-place concrete structure (3) therein after the precast concrete slab (1) and the steel box (2) are fabricated.

6. The template of the assembled track beam concrete post-cast groove opening comprises an upper template (4) and a lower template (5), and is characterized in that the upper template (4) and the lower template (5) can be disassembled and assembled, the upper template (4) and the lower template (5) are used for being arranged around the notch body (11) according to any one of claims 1-5, a plurality of half slotted holes (6) are formed in the bottom edge of the upper template (4), a plurality of corresponding half slotted holes (6) are formed in the top edge of the lower template (5), slotted holes are formed in the half slotted holes (6) after assembly, reinforcing steel bars on a reinforcing steel bar net (12) enter the area of the precast concrete slab (1) to be cast through the slotted holes, and the bottom edge of the upper template (4) and the top edge of the lower template (5) can be in rotatable abutting joint along the length direction axis.

7. The formwork according to claim 6, wherein the longitudinal section of the lower edge of the upper formwork (4) along the length direction is a U-shaped flange (41), and the longitudinal section of the corresponding upper edge of the lower formwork (5) along the length direction is a U-shaped groove (51), and the U-shaped flange (41) is matched with the U-shaped groove (51).

8. The template according to claim 6, characterized in that the longitudinal section of the bottom edge of the upper template (4) along the length direction is a U-shaped groove (51), and the longitudinal section of the corresponding top edge of the lower template (5) along the length direction is a U-shaped flange (41), and the U-shaped flange (41) is matched with the U-shaped groove (51).

9. Formwork according to claim 6, wherein the side of the upper formwork (4) facing the area of the precast concrete panel (1) to be cast and the side of the lower formwork (5) facing the area of the precast concrete panel (1) to be cast are provided with a plurality of protrusions (7).

10. Formwork according to any one of claims 6 to 9, wherein the upper formwork (4) and the lower formwork (5) are steel or wood formwork.

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